wusb300n, hp slimline computer and vista

I have a hp slimline pavilion s3407c computer with vista HP installed. When I have my wusb300n wireless adapter connected the boot screen hangs in the BIOS at the CPU description for about 3.5 minutes and then boots as regular. The wireless network is connecting through a wrt310n router. THe wireless network works well. If I boot the computer with the wusb300n disconnected, the computer boots in less than a minute. The wusb300n will also slow shutdown if it is connected. I have the latest listed driver for the adapter. Has anyone seen this, and if so is there a fix other than physically disconnecting the usb adapter at boot and shutdown?